Geographical clock.



v .UNITED SUxTES 'Patented December 1., 1903.

PATENT OFFICE-. I-

"HENRYSQHUMAGHER, or ASAN FRANCISCO., cAmFoRNiA.

., G E'oGRAPmGAL CLOCK.

vSP1-:cinica'Hort forming pur lnerim Patent Nn 745,680, aatedvnenlbe 1,190e. i

. Application :Med Timber 36,1902, Serial No. l 3 7&096 l(No model.)

`To allfwhbm/ it 'maricon/ceram i Be it. known that I, HENRYfScHMAc'HER,

a citizen of the United lStates,residing in the city and county of SanFrancisemfState of California, have invented an Improvement inGeographicalv Clocks; and I-hereby declare the following to bea full,clear, and exact de-x scription of.-the.same. .w g

My invention relatesl to improvements in tmepieoes whereby the time foranyplace in fthe 'world may be determinedinstantly l vand the time *oflthat 'fp la'ce notedrelativ'e to any other place.v .It has been 'usualin the construction of this classof yclocks to emplOy a dial turnablewith the hein-'hand and on which is map'pcdsa polar projection oftheearth or a portionLth'eref and in relation toV which dal'is astationarydisk graduated according tothe twenty-four hours of :The day.The objection to all these clocks is that with the con tin uedrotationofj thorn-ap it isfalm ost -impossible to readthenamesloplacesit may' bedesired to learn about'rowingfto the fact.

time, and, furthermore, by reasonaailthecon- I stantv change of theposition` 'fa'theplaces about the 'central axis the eye'does not read#`ily become trainedv to look inthe right direction or to thevparticularspot to yfind `the locality wanted. l v One of the objectsofmyy invention is to provide a clock -whereby it'will be very simpletolocate ythe various places u pon the dif.-

feient meridians and to rea'd the. time upon anymeridian. To this end Iemploy a stationarydal having radial `*division-lines corresponding tocerta-injnnitsfof timemeasnre- "ment, between which lines are printedthe names of cities lying in anycorresponding meridian interval.-Concerntricwith this disk f is a revoluble `dial making cnere'volutionin twenty-four hours and having the hours marked onvweigh-teddiskspivoited to th'edial and adapted .always to maintain an uprightposition, so as to be easily read. This dial is movable in 4relation toa stationary vpointer which isset over the city. whence Atimeislto bemeasured.

more fully set forth hereinafter, having-reference tothe accompanyingdrawings, in

. hour-hand proper is used.

in reading the hours, II have' shownlthe latterv las numbered onweighted ldisks 6, p ivotedon Figure' Tl .is a'apiwn view of myinvention-- Fig. 2Eis la section lcfa weighted hour-disk. Fig. '8 isanelevation lof the same. Fig. 4 is a chart for locating various cities.

A represents a `stationary disk fixed to the post 2, which carries theminute-hand' 3. A dial 4, carried hyga'sleeve upon the post, is

'tur-.natale within an .annular area 5 on the disk.4 The dial 4 issubdivided into twentyfour parts, one half numbered from 'l. to 12, the.usual subdivisions of time, vand. representing from midnight to midday,or a.. m., the-other half numbered from l to 12: and representing fromneon-to midnighto'r p. m. The dial makes 'one revolu-` tion intwenty-fourhionrs, while the minutehand 3 nakes one complete revolutionevery hour.. It-Wil-l `be noted thatthe dial :serves :all the 'purposesof an.hourhand,'a nd no In order to assist 'the .dial so asalwaysf'tostand perpendicular. Tihediisl .is in the-formfof a 'wheel having'`a. central open space Vthrough 'which the minntenniarkings on thedi'skAare visible, as at 7,5 lf desired, the disks 6, corresponding to thehours from six p. tn. to six a. m.,may` be y black, -While those .fromsix a. m. to six p. m.-

inaybe white to contrast night and day. .Noon o r meridian 'is indicatedby a radial projection So'nthe dial.

Theannula'r space 5 on fdisk'A is subdivided in-toequalunits Lof\time bythe..radia.l .lines 9. j In the present instance these llines are-dispcsedat intervals of fifteen deg-rees on' the circle, correspondingto one hour of time. -Eweh subdivision maybe designated ysuccessivelybye. letter, as indicated thus; A,

B, C,`D,.,&c. These subdivisions, it will be seen, may be considered asrepresenting fifteen degrees of longitude as the same Vwould appear on'aspherical projectionof the earths surface. Instead, however, of laying-faceef the clock-casing concentric with the` ont a'disterted map of theearth in theanni4 inse-1I simplyprint the names of su'ch places Y -Vfalling withinany certain meridian interval There are further.detailswhich will be in 'a'.- corresponding subdivision of 5. For infstancetartfrom WashingtomDistrict of Go- IOO i gitude west of Greenwich of whichplaces it may'sbe desired to know the time are printed in division A andeach city located within that subdivision situated in its correctrelative position to the right of the`left-hand boundary-line of thatdivision correspondingly with its actual location west of parallel oflongitude seventy-tive degrees.

lao

l is a pointer movable independently of the clock mechanism beneath' thedial'land having aknifefedgeportion l()a movable over the printedsurfaceand adapted to be set at any particular` place whence time is to becomputed. For illustration, assume the clock to be set up in SauAFrancisco and the. San Francisco time at that instant to-be 3.20 p.m.The pointer or marker is moved to coincide with San Francisco, andthenceforth it .remains in that position, as it is intended v.mainly asa marker for the particular local'- only necessary to'glance at thesubdivision of 5 in which that place may be and project the timeintervalindicated on the part of the disk inclosed in the angle of theparticularl subdivision.

To facilitate the readingof time at any city, I provide the dial 4c withan annular transparent projection 11, extending over the annulus 5 andhaving radial markings 12,

corresponding to hours and sixths or other suitable subdivisions ofhours.

for the reason that it enables me to estimate within teu minutes of thecorrect time of any place.

I use sixths For, example,l when itis four oclock p. m., San..Francisco,a glance at Washington shows it to be seven p. m., approximately.London, on the line between subdivisions S and rl,'w illshow the time tobe 12.10 a. m., approximately.'

By providing a chart, as 13, on which the various cities are arrangedalphabetically reaeao and placing after each city the letter designatingin subdivision on annulus 5 the-city can be readily located and the timedetermined.

Having thusdescribed my invention, what l claim, and desire to secure byLetters Patent, isl 1. In a geographical clock,'the combination ofastati'on'ary disk having an annular area located between its center andouter edge, and a circle interior to the annular lspace .and subdividedradially to units of time representing minutes, said disk having itssurface beyond-the annular area subdivided into equal units of time byradial lines; a'movable dial mountedin the annular area of the disk, andhaving an open center through which saidv minute-'markings are visible;cities marked within the radial subdivisions of the disk outside of thediala rigid pointer pivoted beneath the dial and between the same andthe disk, and having a knife-edge portion to move over the sur face ofthedisk; and aminute-h'andv movable in relation tothe dial, said dialserving in lieu of an hour-hand and having it's surface subdivided torepresenty hours.

2. ln a geographical clock, the combination of a stationary disk 'havingan annular area betweeen its centerand outer edge, and having the spacebetween said area and outer `edge subdivided radially and arbitrarilydesignated; a circle interior to the annulararea -of the disk andsubdivided radially to reprosent minutes; a dial subdivided into hoursand rotatably mounted in the annular area of the disk and having an opencenter to expose the minutemarkingthereof; geographical markings inl theradial subdivisions exterior to the v annular area of said'disk; and apointer located between the disk and dial said dial having an annulartransparent peripherall projection extending over the disk and havingradial markings corresponding to hours and subdivisions thereof.

ln'witness whereof Ihavehereunto set my y hand. l

HENRY SCHUMACHER.

li/Vitnesses:

S. H. Nonnen, Jnssin O. BRODIE.

